Whisk the vinegar, soy sauce, sugar, sesame oil and red pepper with the oil. Set aside. (Makes 1/2 cup).
To make salad:
Toss together the cabbage, lettuce, pears, carrots, and green onion in a large bowl, and drizzle with Asian Sesame Dressing, tossing gently to coat. Sprinkle with sesame seeds, if desired. Serve immediately.